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Impedance Studies of the Cell Ag/Ag Beta' Alumina/Ag.
Technical rept. Sep 86-Aug 87,
TECHNISCHE UNIV VIENNA (AUSTRIA) INST FUER TECHNISCHE ELEKTROCHEMIE
Pagination or Media Count:
Measurements of the cell impedance were carried out at constant temperature between 25 and 450 C at frequencies between .01 and .0001 Hertz. The surfaces of the solid electrolyte which was obtained by exchanging the sodium ions of the starting material, sodium beta alumina from Ceramatec Inc., by silver ions in molten silver nitrate were either polished or saw cut. Silver electrodes were attached by silver paint after applying the initial silver layer by sputtering. The silver electrodes display the behavior of a blocking electrode in a wide frequency range at temperatures below about 200 C. This behavior is clearer pronounced on the polished surfaces. The saw cut surfaces show an intermediate behavior between blocking and non-blocking electrodes. A transition from blocking to non-blocking electrode occurs between 150 and 200 C for both types of surfaces. The impedance data are analyzed in the lower temperature range by an analogue network.
APPROVED FOR PUBLIC RELEASE